APA-referens (7:e uppl.)

Hutchinson, T. (1997). Life Lines: Pre-Intermediate student's book (1a. ed. 9. reimp.). OffordUniversity Press.

Chicago-referens (17:e uppl.)

Hutchinson, Tom. Life Lines: Pre-Intermediate Student's Book. 1a. ed. 9. reimp. Estados Unidos: OffordUniversity Press, 1997.

MLA-referens (9:e uppl.)

Hutchinson, Tom. Life Lines: Pre-Intermediate Student's Book. 1a. ed. 9. reimp. OffordUniversity Press, 1997.